#include <stdio.h>
#include <time.h>
#include<stdlib.h>

int main()
{    int a,i,n,o,x,y,z;   
 printf("请输入题目数：");   
 scanf("%d",&n);  
 while(n--)   
 {   
     srand(time(NULL)); 
	 x=rand()%10+1; 
	 y=rand()%10+1;  
	 o=rand()%4;   
     switch(o)    
	 {           
	 case 0:      
		 printf("%d + %d = ",x,y); 
		 a=x+y;    
		 break;         
	 case 1:       
         printf("%d - %d = ",x,y); 
		 a=x-y;         
		 break;        
	 case 2:         
		 printf("%d * %d = ",x,y);
		 a=x*y;     
		 break;      
	 case 3:    
		 printf("%d / %d = ",x,y);  
		 a=x/y;       
         break;  
      }    
	 scanf("%d",&z);
	 i=2;    
	 while(z!=a&&i--) 
	 {           
		 printf("Not Correct! Try again!\n"); 
		 scanf("%d",&z);     
   }      
	 if(z==a) 
		 printf("Right!\n"); 
   }   
 return 0;}